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VideoBackend/OGL: Prefer KHR_subgroup over NV_shader_thread.

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While the NV extension is totally fine, the KHR extension should be able to support more hardware.

For NVIDIA, the hardware either supports both or neither, it just needs a driver from the last two years.
For AMD, the drivers from late 2022-12 seems to bring support for the KHR extension.
For Intel, the KHR is also supported for some years.
This commit is contained in:
degasus 2023-01-31 18:10:48 +01:00
commit 4b2aa948e6
8 changed files with 66 additions and 33 deletions
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3
Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp
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@ -81,9 +81,8 @@ static const char SUBGROUP_HELPER_HEADER[] = R"(
#extension GL_KHR_shader_subgroup_ballot : enable
#define SUPPORTS_SUBGROUP_REDUCTION 1
#define CAN_USE_SUBGROUP_REDUCTION true
#define IS_HELPER_INVOCATION gl_HelperInvocation
#define IS_FIRST_ACTIVE_INVOCATION (gl_SubgroupInvocationID == subgroupBallotFindLSB(subgroupBallot(!gl_HelperInvocation)))
#define IS_FIRST_ACTIVE_INVOCATION (subgroupElect())
#define SUBGROUP_MIN(value) value = subgroupMin(value)
#define SUBGROUP_MAX(value) value = subgroupMax(value)
)";